Seems that you like editing models. What about a Station Wagon of this LTD http://www.gta4-mods.com/vehicles/1983-ford-ltd-crown-victoria-f5027 ? Parts for the new Trunk you maybe could take from this 64´ Counrtry Sqiure http://www.gta4-mods.com/vehicles/ford-country-squire-f22147 .

By the way, your Regina Coupe looks very well, but I like realism, so I prefer real cars. But it looks good, thats the reason why I´m asking you for a Wagon LTD and not someone else. Sadly, the original author does´nt replied. :(